Medik8 C-Tetra Lipid Vitamin C Serum Versus Paula's Choice 25% Vitamin C + Glutathione Clinical Serum

Medik8 C-Tetra Lipid Vitamin C Serum Versus Paula's Choice 25% Vitamin C + Glutathione Clinical Serum Detailed comparison of Medik8 C-Tetra Lipid Vitamin C Serum versus Paula's Choice 25% Vitamin C + Glutathione Clinical Serum. This brightening serum is formulated around Tetrahexyldecyl Ascorbate and Simmondsia Chinensis Seed Oil to brighten dull-looking skin and fade the look of dark spots. This brightening serum is formulated around Tetrahexyldecyl Ascorbate and Ascorbyl Glucoside to brighten dull-looking skin and fade the look of dark spots. Simmondsia Chinensis Seed Oil Cyclopentasiloxane Cyclohexasiloxane Tetrahexyldecyl Ascorbate Citrus Grandis Peel Oil Tocopheryl Acetate PPG-12/Smdi Copolymer Limonene Citral Linalool Geraniol Simmondsia Chinensis Seed Oil, Cyclopentasiloxane, Cyclohexasiloxane, Tetrahexyldecyl Ascorbate, Citrus Grandis Peel Oil, Tocopheryl Acetate, PPG-12/Smdi Copolymer, Limonene, Citral, Linalool, Geraniol Water Dimethicone Glycerin C9-12 Alkane Ascorbyl Glucoside Silica Pyrus Malus Fruit Extract Hydrogenated Lecithin Polyglyceryl-6 Polyricinoleate Acrylates/C10-30 Alkyl Acrylate Crosspolymer Xanthan Gum Oryza Sativa Bran Extract Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer Cetyl Alcohol Caprylyl Glycol Lysine Carboxymethyl Cysteinate Coco-Caprylate/Caprate Tocopherol Glutathione Sodium Citrate Sodium Phytate Hexylene Glycol Ethylhexylglycerin Helianthus Annuus Seed Extract Urea Mannitol Caprylic/Capric Triglyceride Sodium PCA Rosmarinus Officinalis Leaf Extract Polysorbate 60 Sorbitan Isostearate Trehalose Ascorbic Acid Glucose Vanilla Planifolia Fruit Extract Polyquaternium-51 Ergothioneine Triacetin Sodium Hyaluronate Phenoxyethanol Water, Tetrahexyldecyl Ascorbate, Dimethicone, Glycerin, C9-12 Alkane, Ascorbyl Glucoside, Silica, Pyrus Malus Fruit Extract, Hydrogenated Lecithin, Polyglyceryl-6 Polyricinoleate, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Xanthan Gum, Oryza Sativa Bran Extract, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Cetyl Alcohol, Caprylyl Glycol, Lysine Carboxymethyl Cysteinate, Coco-Caprylate/Caprate, Tocopherol, Glutathione, Sodium Citrate, Sodium Phytate, Hexylene Glycol, Ethylhexylglycerin, Helianthus Annuus Seed Extract, Urea, Mannitol, Caprylic/Capric Triglyceride, Sodium PCA, Rosmarinus Officinalis Leaf Extract, Polysorbate 60, Sorbitan Isostearate, Trehalose, Ascorbic Acid, Glucose, Vanilla Planifolia Fruit Extract, Polyquaternium-51, Ergothioneine, Triacetin, Sodium Hyaluronate, Phenoxyethanol These ingredients are found in both products. Ingredients higher up in an ingredient list are typically present in a larger amount. Tetrahexyldecyl Ascorbate (THD) is a stable and oil-soluble form of Vitamin C. THD is special in that it has the ability to travel deeper into skin than traditional ascorbic acid while maintaining the same skin benefits (double win!). Because it’s oil-soluble, THD dives deep into your skin’s fatty layers (think ceramides and cholesterol) to fight off the kind of free radicals that mess with your skin barrier. This makes it a great pair with water-based vitamin C (ascorbic acid) that mainly works on the surface. Even at just 0.1%, THD is already showing great antioxidant activity. When used up to 2%, it helps keep your skin happy and calm, especially when it’s stressed from pollution or sun. Want to fade dark spots or tackle hyperpigmentation? You’ll want 5% or more. Pairing it with brightening buddies like niacinamide or licorice root gives even better results. One study even used 30% THD with other brighteners and saw real results on stubborn discoloration, even in melasma-prone skin. A note on THD: It’s has a slightly silky, oily texture and usually shows up colorless or pale yellow (though the exact shade can vary by supplier). While you can sneak it into water-based formulas, it really shines when paired with silicones or oils, which help your skin soak it up better. THD is pretty stable, but it’s still vulnerable to degradation like ascorbic acid. Too much light or heat (above 113°F / 45°C) can break it down over time. Go for dark and opaque packaging that keeps it safe and shady! Read more about other types of Vitamin C: